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Inventories (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 98,451 $ 65,319
Work-in-process 62,381 54,555
Finished goods 234,912 196,297
Inventory, Net $ 395,744 $ 316,171